I have put a total of 19,873 miles on so far, 80% highway. Best tank was 32mpg, worst was 26mpg. Average has been around 28-29, a long way from the stickers 34mpg rating. It has been getting a little better lately, but that could just be due to the current warm spell, or break-in. I also had the ECM updated to cure a hard starting problem last month. The mileage got a little better.